        body {
            font-family: '微软雅黑', Arial, sans-serif;
            background: #f7f7f7;
            color: #333;
            margin: 0;
        }
        .top-nav {
            background: #fff;
            box-shadow: 0 2px 8px #eee;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 40px;
            height: 60px;
            position: sticky;
            top: 0;
            z-index: 10;
        }
        .top-nav .logo { font-size: 24px; color: #2a8cff; font-weight: bold; }
        .top-nav ul { list-style: none; display: flex; gap: 30px; margin: 0; padding: 0; }
        .top-nav ul li { cursor: pointer; }
        .search-bar {
            display: flex;
            justify-content: center;
            margin: 24px 0 0 0;
        }
        .search-bar input {
            width: 400px;
            padding: 10px 16px;
            border-radius: 20px;
            border: 1px solid #ddd;
            font-size: 16px;
            outline: none;
        }
        /* Banner横幅化 */
        .banner {
            position: relative;
            width: 100%;
            height: 300px;
            background: linear-gradient(90deg, #eaf6ff 60%, #fff 100%);
            display: flex;
            align-items: center;
            justify-content: flex-start;
            padding-left: 8vw;
            margin-bottom: 18px;
        }
        .banner img {
            height: 160px;
            border-radius: 12px;
            box-shadow: 0 4px 24px #d0e6ff;
            margin-right: 40px;
            background: #fff;
        }
        .banner-text {
            position: static;
            color: #2a8cff;
            text-align: left;
        }
        .banner-text h1 {
            font-size: 2.2rem;
            font-weight: bold;
            margin-bottom: 8px;
        }
        .banner-text p {
            font-size: 1.1rem;
            color: #4a90e2;
            margin-bottom: 16px;
        }
        .banner-text .btn {
            background: #2a8cff;
            color: #fff;
            padding: 8px 28px;
            border-radius: 20px;
            text-decoration: none;
            font-size: 1rem;
            box-shadow: 0 2px 8px #b3d8ff;
            transition: background 0.2s;
            display: inline-block;
        }
        .banner-text .btn:hover {
            background: #176fd6;
        }
        /* 轮播图 */
        .carousel-container {
            width: 100%;
            display: flex;
            flex-direction: column;
            align-items: center;
            margin: 0 0 0 0;
        }
        .carousel {
            position: relative;
            width: 700px;
            height: 220px;
            overflow: hidden;
            border-radius: 18px;
            box-shadow: 0 2px 16px #e3eaf2;
            background: #fff;
            margin: 0 auto 10px auto;
        }
        .carousel-img {
            width: 100%;
            height: 220px;
            object-fit: cover;
            position: absolute;
            left: 0; top: 0;
            opacity: 0;
            transition: opacity 0.5s;
            z-index: 1;
        }
        .carousel-img.active {
            opacity: 1;
            z-index: 2;
        }
        .carousel-btn {
            position: absolute;
            top: 50%;
            transform: translateY(-50%);
            background: rgba(255,255,255,0.7);
            border: none;
            font-size: 2rem;
            color: #2a8cff;
            border-radius: 50%;
            width: 38px;
            height: 38px;
            cursor: pointer;
            z-index: 3;
            box-shadow: 0 2px 8px #e3eaf2;
        }
        .carousel-btn.prev { left: 12px; }
        .carousel-btn.next { right: 12px; }
        .carousel-dots {
            display: flex;
            justify-content: center;
            margin-top: 10px;
            gap: 10px;
        }
        .dot {
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: #cbe2ff;
            display: inline-block;
            cursor: pointer;
            transition: background 0.2s;
        }
        .dot.active { background: #2a8cff; }
        /* 分类圆形icon区块 */
        .category-round {
            display: flex;
            justify-content: center;
            gap: 48px;
            margin: 18px 0 36px 0;
        }
        .category-icon-round {
            display: flex;
            flex-direction: column;
            align-items: center;
            cursor: pointer;
            transition: transform 0.15s, box-shadow 0.15s;
        }
        .category-icon-round .icon-bg {
            width: 80px;
            height: 80px;
            background: #fff;
            border-radius: 50%;
            box-shadow: 0 2px 12px #e3eaf2;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 10px;
            transition: box-shadow 0.2s;
        }
        .category-icon-round img {
            width: 48px;
            height: 48px;
        }
        .category-icon-round span {
            font-size: 1.08rem;
            color: #2a8cff;
            font-weight: bold;
            margin-top: 2px;
        }
        .category-icon-round:hover {
            transform: translateY(-6px) scale(1.07);
        }
        .category-icon-round:hover .icon-bg {
            box-shadow: 0 6px 24px #cbe2ff;
        }
        /* 商品卡片区块 */
        .product-list {
            max-width: 1200px;
            margin: 0 auto;
            padding: 30px 0;
        }
        .product-list h2 {
            margin-left: 16px;
            color: #2a8cff;
            font-size: 1.4rem;
            font-weight: bold;
            letter-spacing: 1px;
        }
        .products {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            justify-content: flex-start;
        }
        .product-card {
            background: #fff;
            border-radius: 18px;
            box-shadow: 0 2px 12px #e3eaf2;
            width: 240px;
            padding: 18px 12px 16px 12px;
            text-align: center;
            transition: box-shadow 0.2s, transform 0.2s;
        }
        .product-card:hover {
            box-shadow: 0 8px 32px #b3d8ff;
            transform: translateY(-6px) scale(1.03);
        }
        .product-card img {
            width: 100%;
            height: 150px;
            object-fit: contain;
            border-radius: 10px;
            background: #f6fafd;
        }
        .product-card .info h3 {
            font-size: 1.1rem;
            font-weight: bold;
            margin: 10px 0 6px 0;
            color: #222;
        }
        .product-card .info p {
            margin: 0 0 4px 0;
            font-size: 1rem;
            color: #222;
        }
        .product-card .info .old-price {
            color: #aaa;
            text-decoration: line-through;
            font-size: 0.95rem;
            margin-left: 8px;
        }
        .product-card .info span {
            color: #4caf50;
            font-size: 0.98rem;
            font-weight: 500;
        }
        /* 底部导航 */
        .bottom-nav {
            display: flex;
            justify-content: space-around;
            background-color: #fff;
            padding: 10px 0;
            border-top: 1px solid #ddd;
        }
        .bottom-nav .nav-item {
            text-align: center;
            cursor: pointer;
        }
        .bottom-nav .nav-item img {
            width: 24px;
            height: 24px;
        }
        .bottom-nav .nav-item span {
            display: block;
            font-size: 12px;
            color: #333;
        }
        .bottom-nav .nav-item img.active {
            background-color: red;
            border-radius: 50%;
        }
        /* 响应式适配 */
        @media (max-width: 900px) {
            .carousel { width: 98vw; min-width: 0; }
            .carousel-img { height: 32vw; min-height: 120px; }
            .category-round { gap: 18px; }
            .category-icon-round .icon-bg { width: 60px; height: 60px; }
            .category-icon-round img { width: 36px; height: 36px; }
        }
        @media (max-width: 600px) {
            .carousel { width: 100vw; height: 120px; }
            .carousel-img { height: 120px; }
            .category-round { flex-wrap: wrap; gap: 10px; }
            .category-icon-round .icon-bg { width: 48px; height: 48px; }
            .category-icon-round img { width: 28px; height: 28px; }
        }